Re: SAX Validation
Mark Papiani <mp@e...> writes: > I believe that one of the advantages of SAX parsers is that they report > parsing events via callbacks and > can consume far less memory than DOM based parsers that build an in > memory parse tree. > > My question has to do with when validation errors are reported by SAX > parsers. For example, if the closing tag of the root element is missing > from an XML document, would a SAX parser only report that the document > was invalid, after it had reported all the other valid parsing events > for the rest of the document? That really depends on the parser -- it has to report the error some time before the endDocument() event, but when it does so depends on the implementation. If (for example) your parser builds an in-memory tree first and then walks through it or if it buffers part or all of the event stream, it might report the error immediately after the startDocument() event. Typically, though, the parser will deliver events as it finds them, so you won't find out about the problem until near the end. By the way, the missing tag is a well-formedness error, so SAX parsers will use fatalError() rather than error() to report it. All the best, David -- David Megginson david@m... http://www.megginson.com/ xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@i... Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ and on CD-ROM/ISBN 981-02-3594-1 To unsubscribe, mailto:majordomo@i... the following message; unsubscribe xml-dev To subscribe to the digests, mailto:majordomo@i... the following message; subscribe xml-dev-digest List coordinator, Henry Rzepa (mailto:rzepa@i...)
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